Sock



FIG. 1 is a side elevational view of a sock showing my new design, the opposite side elevational view being a mirror image thereof;

FIG. 2 is a front elevational view thereof, the rear elevational view being substantially the same; and

FIG. 3 is a top plan view thereof.

The back elevational view is substantially identical to the front elevational view of FIG. 2. 

The ornamental design for a sock, as shown and described. 